Lubricating twist-drill



Pa/ented Sept. 7,1897.

W. J. RICKEY.

LUBRIGATING TWIST DRILL.

(No Model.)

Mai/'1.665 e3;-

, UNITED STATESPATENT trice.

WALTER J. RICKEY, OF DANBURY, CONNECTICUT, ASSIGNOR TO THE T. t B. TOOLCOMPANY, OF SAME PLACE AND PORTLAND, MATNE.

LUBRICATING .TWIST-DRILL.

SPECIFICATION forming part of Letters Patent No. 589,576, datedSeptember 7, 189'?.

Application tiled February Z0, 1897. Serial No. 624,380. (No model.)

To all whom c may concern: eline toward each other and toward the axisBe it known that I, XVALTER J. RIUKEY, a of the rod, as shown in Fig. l.A line 3 is citizen of the United States, residing at Danusually scoredon the surface of the rod thus bury, in the county of Fairfield andState of bored just outside of and parallel with one 55 5 Connecticut,have invented certain new and or both of Athe passages, as indicated inFig. 2. useful Improvements. in Lubricating Twist- This scored blank isthen heated and while Drills, of which the following is a speciiicahotone end is held and the other end twisted tion. until the passagesassume the spiral of the The invention relates lo those twist-drillslands that will remain after the grooves have 6o ro that have internalpassages through which been formed. The spiral of the lands beinglubricatingmaterial maybe forced tothe cutknown the necessary twist togive the pasting-lips for washing out the chips and consages the properspiral is readily determined ducting away the heat incident to drillingand by the positions of the lines These lines for otherwise aiding thecutting action of thel being on the surfaces directly outside of thev 65 drill and prolonging its life. passages the heated blank is twisteduntil The object is to provide an attractive apthe lines occupypositions which will be pracpearing and inexpensive drill ot' this classtically the middle of the lands to be formed. which will be strong,durable, and very efii- Any common shank 4 may then be formed, cient.and this shank is usually bored to provide a 7o 2o The invention residesin a twistdrill having chamber 5, into which the passages Q may lead.

a common cutting-point and holding-shank, After the body of this twistedblank, as illusa strong web and ordinary spiral grooves, and trated inFig. 3, has been turned to about the lands between the point and shank,with spisize of the completed drill grooves t, of any ral passages inthe solid metal beneath the approvedshape, maybe milled or otherwise 7525 surfaces of the spiral lands, as more particuformed on the desiredpitch between the paslarly hereinafter described, and pointed ont sages.The pitch of the grooves maybe either in the claims. constant orincreased, according as the pas- On the accompanying'sheet of drawings,sages have been twisted, which passages are. which illustrate anembodiment of the inventhus left in the solid body of the lands 7 be- 8o5ction and the method of producing the same, tween the grooves. Theblank is then by any Figure l is a view of a rod with two perforacommonmeans given the desired point and tions and illustrates the blank at oneperiod cleared and sharpened in the usual manner. during the process ofmaking a drill, which The grooves are preferably formed in such embodiesthe invention. Fig. 2 is a view of manner as to'leave a webof'increasing thick- 85 35 the same rod rotated ninety degrees. Fig. 3ness from point to shank, and the passages is a view of the blank afterother operations are located far enough from the axis of the of theprocess of manufacture have been perdrill to leave a strong web and yetnot be formed. Fig. e is a view of a completed drill suflicientl y nearthe surfaces to weaken the made from this blank; and Fig. 5 shows alands or the cutting edges. lt is preferred 9o 4o view lof the shankend, atransverse sectional that the passages incline toward each otherview, and a view looking at the point of the from the point to the shankin order that of the drill shown in Fig. 4:. they maybe in the heaviestpart of the lands, In the process of making a drill which emaway fromthe web near the point, and yet bodies the invention a steel rod l ofcircular enter a chamber in the shank of such moder- 95 45 cross-sectionformed to approximately thediate size that it will not materially weakenameter and length of the completed drill is the walls of the shank.boredto form passages 2. These passages may When a drill embodying thisinvention is be bored completel y through or only part way in use, as ina screw or other chucking maof the lengt-h of the rod and they mayextend chine, a stream of lubricating-oil can be roc 5o parallel witheach other and with the axis ot' forced by a small pump or otherwisefrom the rod or, as is most preferred, they mayinthe shank through thepassages to the point,

so'as tO wash out the chips incident to the cutting b y the lips andconductaway the heat generated by rapid boring. The application Of alubricant in this manner permits of a considerable increase in the rateof borin g over the Ordinary manner and prolongs the life of the drillbeyond the limit of an ordinary drill. This drill is strong, for a webof good form may be left intact and the comparativelysmall chamberprovided in the shank does not appreciably weaken the structure of thedrill. y

It is durable, for the exterior surfaces of the lands are solid andstiff, and it is efficient, for the passages in the solid metal of thelands permit of the thorough lubrication of the cutting-lips of thedrill Withoutnecessitating the removal of but a slight portion of themetal of the body of the drill. The drill is neat and attractive inappearance, for the passages are entirely concealed, except at thepoint, and the surfaces of the lands are not cut, marred, or filled withmetal different from that Of which the drill is formed, and the drillisinexpensive,forthe operations performed in the process of itsmanufacture are not complicated or many.

I claim as my inventionl. A drill having spiral grooves and spiral landswith spiral passages surrounded by solid metal beneath the surfaces ofthe lands, substantially as specified.

2. A drill having point, shank, web, spiral grooves and spiral landswith spiral passages in the solid metal beneath the surfaces of thelands, said passages Opening through thc point and shank, substantiallyas specified.

A drill having point, shank, web, spiral grooves and spiral lands withspiral passages in the solid metal beneath the surfaces of the lands,said passages inclining to the axis of the drill and opening through thepoint and shank, substantially as specified.

4. A drill having point, shank, web, spiral grooves and spiral landswith spiral passages in the solid metal outside of the web of the drillbut entirely beneath the surfaces of the lands, substantially asspecified.

5. A drill having a point,chambered shank. web, spiral grooves andspiral lands with spiral passages in the solid metal beneath thesurfaces of the lands, said passages opening through the point lat one.end and into the chambered shank at. the other end, substantially asspecified.

G. The method of forminglubricating-drills which consists in boring arod to form passages, scoring said rod outside of the passages. heatingthe scored rod and twisting it while hot until the passages assume thespiral of the lands to be formed, then milling the grooves and pointingand finishing the drill. substantially as described and for the purposespecified.

XV ALTER J. RICKEY.

\Vitnesses:

A. SHELTON DAVENPORT, JOHN R. BOOTH.

